Mine runs better on YS 20\20 fuel, 13X6 MA prop with an enya #3 plug. I also usw Fox Miricle plugs. The setting on mine were really touchy until I went with the YS 20\20 fuel. Now the needles do not need to be exact. If they are off a notch or four it still runs very well. How many runs have you done on this engine? I spent about half a gallon breaking it in. Now it scream and runs any where I put the throttle.

Dru.